CN1637722A - Method and system for managing data access requests utilizing storage meta data processing - Google Patents
Method and system for managing data access requests utilizing storage meta data processing Download PDFInfo
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- CN1637722A CN1637722A CNA2004100909773A CN200410090977A CN1637722A CN 1637722 A CN1637722 A CN 1637722A CN A2004100909773 A CNA2004100909773 A CN A2004100909773A CN 200410090977 A CN200410090977 A CN 200410090977A CN 1637722 A CN1637722 A CN 1637722A
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- 238000007726 management method Methods 0.000 claims description 37
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- 238000013500 data storage Methods 0.000 claims description 11
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- 238000006116 polymerization reaction Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
- G06F16/2453—Query optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
- G06F16/2455—Query execution
- G06F16/24552—Database cache management
Abstract
A method and system are provided for managing requests to access data in a computer environment. In one aspect of the present invention, a request manager receives a request associated with meta data corresponding to data that is maintained separately from the meta data. In another aspect, the request manager informs a data object manager of an anticipated request that will be received by the data object manager to enable it to prepare for the anticipated request. The data object manager commences preparing for the anticipated request in response to being informed of the anticipated request to facilitate a reduction in data access time. In one example of a computing environment utilizing one or aspects of the invention, a storage subsystem comprising a data object manager prepares for the anticipated request by pre-fetching data blocks from storage media into a cache.
Description
Technical field
The present invention relates generally to the data access request management in the communication environment, and more specifically, the request of access that relates to an expection of notification data Object Manager to the data in the storage medium, this expection request of access be based on receive with corresponding to the relevant request of the metadata of these data.
Background technology
Storage subsystem generally includes some disk drives, and these drivers can polymerization get up and one or more client computers are shown as the virtual disk driver.In order to improve performance, storage subsystem utilizes high-speed cache to keep the dish piece of frequent access usually.Need the selection of the dish piece of high-speed cache that overall system performance is had material impact.Some storage subsystems attempt to predict that by the historical pattern of inspection dish block access which dish piece may be by the client computer request.The character of this cache management algorithm is predictability.
Although there is technology to be used for the request of access of supervisory communications environment at present, because its these technology of prediction essence may make storage subsystem not going into high-speed cache by accessed Data Loading in expeced time to data.Therefore, according to need further, the technology of in the promotion computer environment request of access of data being managed.
Summary of the invention
Overcome the shortcoming of prior art and additional advantage is provided by the method that a kind of management request is provided.In one aspect of the invention, manager receive one with the relevant request of metadata corresponding to data (these data and metadata separate storage).In another aspect of this invention, this manager is notified another manager one request expection, that this another manager will receive, serves as that the expection request is prepared to make it.
System corresponding with said method and computer program have also been done at this and have been described and proposed claim.
Additional feature and advantage have been realized by technology of the present invention.This describe in detail other embodiment of the present invention and aspect, embodiment also thinks that they are parts of the present invention.
Description of drawings
In the claim of instructions ending, particularly pointed out and clearly claimed be considered to theme of the present invention.Read following detailed in conjunction with the drawings, aforesaid and other object, feature and advantage of the present invention are obvious, in the accompanying drawings:
Fig. 1 represented according to one aspect of the present invention, a kind of process flow diagram that is used at an embodiment of the technology of computer environment management data request;
Fig. 2 represented according to one aspect of the present invention, a kind of process flow diagram that is used at another embodiment of the technology of computer environment management data request;
Fig. 3 has represented according to one aspect of the present invention, a kind of being used at the embodiment of data with the technology of the environment management data request of the metadata separate storage that is relevant to these data;
Fig. 4 has represented according to one aspect of the present invention, has utilized an example of the environment of data access request administrative skill;
Fig. 5 has represented according to one aspect of the present invention, has utilized another example of the environment of request of data administrative skill;
Fig. 6 has represented according to one aspect of the present invention, has utilized the 3rd example of the environment of request of data administrative skill.
Embodiment
In one aspect of the invention, a manager is received a request relevant with metadata.This manager is notified another manager one request expection, that this another manager will receive, makes it to prepare for this expection request.
Describe an a kind of aspect below in conjunction with the request management flow process Figure 60 shown in Fig. 1, in computer environment, manage the technology of request associated with the data according to this aspect.At first, step 61 comprises that a request manager receives a request relevant with metadata.In step 62, request manager notification data Object Manager is about the change of the metadata of data object then.Make a data Object Management group decision-making at step 63 data object management device, and if necessary, carry out this data object management decision-making in step 64.
A kind of being used for aspect the technology of the computer environment management request relevant with data object further described according to one aspect of the present invention below in conjunction with flow process Figure 50 among Fig. 2.At first, step 51 comprises that a request manager receives the request of using.Then, be authorized to allow to use data object if in step 52, determine communication unit, then respectively in step 53 and 55 request manager send a request management message to a data Object Manager, and almost side by side reply one and use the request response to give a communication unit.After step 53 and 55, the data object management device is prepared for the expection request in step 54 respectively, and transmission data use communication between communication unit and data object management device in step 56.In an example, the transmission data use the step of communication to comprise the request of communication unit transmission data block, and the transmission of data object management device comprises the data of the requested date piece of data object.Otherwise if a data object is used in the uncommitted permission of communication unit, then step 57 comprises that request manager is to a use request of communication unit answer response.
Describe according to one aspect of the present invention below in conjunction with Fig. 3, utilized an example of the communication environment of data object request administrative skill.But in the environment of a data object and metadata separate storage thereof, request manager 10 receives the request of using by request management network 12 from communication unit 20.Request manager 10 transmits a request management message by privately owned networking 14 and gives data object management device 30, and replys one by request management network 12 to communication unit 20 and use the request response.If communication unit 20 is authorized to allow to use data object 40, then between communication unit 20 and data object management device 30, transmit the communication of supporting that data object 40 uses by data network 16.
Usually, in the compunication environment, metadata and user data all are associated with data object.User data is to certain user or handles the significant information of program of these data.The example of user data is as a Freelance Graphics
The content of demonstration perhaps is stored in the employee information in the relevant database.Metadata is the data about user data.The example of the metadata relevant with data object includes the sign, data object type of the client computer of access rights, the date and time of piece tabulation, access privilege information, document creation or the renewal of relevant filename, file size, composing document with one group of dish piece.Data object comprises data.Data object type comprises the daily record of data file, checkpoint file, file system, logical volume and Journaling File System (JFS) logical volume.
The advantage of using this technology to bring in computer environment shown in Figure 3 comprises: improved data object access security, the data object access speed is regulated, the arbitration of data object access priority, and the raising of data object access speed.
An emerging class storage environment is user data and metadata separate storage and provide other network of branch to come transmitting user data and metadata.The Storage Tank that an example of this storage environment is an IBM Corporation
TMFile system, wherein Storage Tank
TMClient's (computing machine) is from a storage subsystem (using the piece host-host protocol by storage area network (SAN)) calling party data, from a center Storage Tank
TMMetadata controller (using ICP/IP protocol to pass through Ethernet) accesses meta-data.User data with can be separating of metadata logic or physics.Storage subsystem generally includes somely can polymerization gets up and is shown as the disk drive of virtual disk driver to one or more client computers, and often uses high-speed cache to keep the dish piece of frequent access to improve the input and output performance.
One or more aspect of the present invention has utilized such fact, when being user data and separated from meta-data, provide extra information with file access metadata processing simultaneously, it can be used for notifying the storage subsystem I/O in future (I/O) request of access.Storage subsystem can utilize these information to promote internally cached management.
Describe according to one aspect of the present invention below in conjunction with Fig. 4, utilize an example of the information management data storage subsystem high speed cache contents of handling the file metadata acquisition.When client computer 210 need read and renewal is associated with a file on the storage subsystem 230 some dish pieces, client computer 210 must be authorized to the exclusive lock on the associated disc piece.Client computer 210 is initiated the affairs of request lock to metadata controller 220.This lock request expression client computer 210 is wished the following I/O operation of carrying out on the dish piece of certain certain scope.If metadata controller 220 can be authorized this request lock, metadata controller 220 can transmission one " prompting " storage subsystem 230 of giving these pieces of storage, show that storage subsystem can expect the I/O request to the dish piece of a certain particular range of reception from client computer.Metadata controller (MDC) 220 transmits this " prompting " to storage subsystem 230 by private network 222.Basically side by side, metadata controller 220 signals for client computer 210 by metadata network 212 and authorizes this lock.In this exemplary embodiment, MDC 220 is examples of a request manager, and the storage subsystem controller 236 of storage subsystem 230 is examples of a data Object Manager.
If the dish piece that storage subsystem 230 is determined request is not in high-speed cache 232, it is prefetched to the piece of request in the high-speed cache 232 from memory disc 234.After receiving the lock of request, client computer 210 is initiated an I/O operation by data network 214 to storage subsystem 230, receives at least some the dish pieces in the dish piece of the lock on it with access.When storage subsystem 230 received the I/O request of client's initiation, owing to look ahead, storage subsystem may have the dish piece of request in its high-speed cache.Even without, owing to before received prompting from metadata controller 220, storage subsystem 230 has begun necessary physics I/O operation and has come packaged being downloaded in the high-speed cache 232 of request.When the dish piece of asking is in high-speed cache 232, transfer them to client computer 210 from high-speed cache 232 by data network 214.Storage subsystem 230 is initiation dish I/O operation before the request that receives client computer 210, is stored in the high-speed cache 232 with the dish piece that will ask client computer to visit, and consequently the stand-by period of data access has reduced.
Method of the present invention also is used in the operation of example context shown in Figure 4 when client computer is write storage subsystem to the dish piece.If client computer 210 sends affairs to metadata controller 220, show that client computer closed a file, and finished piece is write storage subsystem, metadata controller 220 transmits this information by private network 222 to storage subsystem 230.Whether storage subsystem 230 discharges according to " prompting " decisions of this closing of a file message and relevant other following data access request that may receive has been stored the storage unit dish piece that constitutes this file of closing, in the high-speed cache 232.The storage unit that discharges in the high-speed cache 232 allows for fast access and store other dish pieces in high-speed cache.
According to one aspect of the present invention, another example of utilize handling the cache content of the information management data storage subsystem that file metadata obtains relates to computing machine and writes a big file of unlikely being read.An example of this file is the check point that produces of long playing computational tasks/a restart file or a database log file.These files generally are used for recovering the state of a computational workload after computer crashes.Because computer crashes is rare, check point/restart general regular writing, but seldom read.Can be used for notifying storage subsystem at check point/restart and it is not carried out high-speed cache after file writes dish to the understanding of this information.
Exemplary environments in conjunction with Fig. 4 has been done to further describe to this example.When computing machine 210 wishes to write a check point/when restarting file, to metadata controller 220 request write permissions, and notice metadata controller 220 these files should be by high-speed cache versatilely by metadata network 212 for it.Another selection is, it is a specific type (for example check point/restart file) that metadata controller 220 can automatically identify this file.Metadata controller 220 is authorized and is allowed computing machine 210 to write this document, the piece tabulation that provides file to write, and simultaneously by private network 222, memory controller 236 computing machines 210 of notice storage subsystem 230 prepare to write one should be in the high-speed cache 232 of storage subsystem by the big file of high-speed cache versatilely.
When computing machine 210 is write storage subsystem 230 to file by data network 214,236 decisions of storage subsystem controller distribute much spaces of high-speed cache 232 to store all or part of big file, and as soon as possible the content of big file are write the memory disc 234 of storage subsystem.In case the content of file (or partial content) writes the memory disc 234 of storage subsystem, the associated documents data in the high-speed cache 232 can be dropped at once, because the possibility that this file need be read out again is very little.Therefore, the knowledge of the type of the stored data that obtains based on the metadata of handling file is used high-speed cache, helps optimizing the use of cache resources.
An example relevant with above-mentioned example relates to a computing machine and read a previously described check point/the restart state that file recovers a computational workload after collapse.The understanding that can utilize this file seldom to be read, notify storage subsystem this file from dish, read the back not high-speed cache it.It is pointed out that the management about the cache content in the data storage subsystem of this example that describes below is applicable to any big file that may ask without frequentation.
With reference to figure 4, computing machine 210 attempts to read a check point/restart file, therefore computing machine 210 allows so that read file from metadata controller 220 requests by metadata network 212, and notice metadata controller 220 these files should be by proactive caching.Perhaps, it is specific type (for example a check point/restart file) that metadata controller 220 automatically identifies this file, rather than needs computing machine 210 notices.Metadata controller 220 is authorized and is allowed computing machine 210 to read file, the piece tabulation at file place is provided, and simultaneously, by the storage subsystem controller 236 of private network 222 notice storage subsystems 230, computing machine 210 will read in the high-speed cache 232 that should not be in storage subsystem by the big file of high-speed cache versatilely.When computing machine 210 was read file by data network 214 from storage subsystem 230,236 decisions of storage subsystem controller distributed much spaces of high-speed cache 232 to be used for reading file from memory disc 234.In case the content of file (or partial content) is transferred to computing machine 210, the associated documents data in the high-speed cache 232 just can abandon at once, because the possibility that this file need be read once more is very little.Therefore, use high-speed cache, discharged cache resources, help improving access speed alternative document based on the metadata of handling file types that determine, accessed data.
Describe according to one aspect of the present invention below in conjunction with Fig. 5, use a kind of technology of managed data object request of access, so that utilize to handle the information that file metadata obtains, realize another example of a kind of environment of the cache content management of data storage subsystem.In this example, some computing machines (310,311 and 312) are the members that a database is trooped.In the computing machine 310,311 and 312 each is all moved an example of cluster database.When computing machine 310 was wished to read and upgraded some dish pieces that are associated with a database table that is positioned at storage subsystem 330, computing machine 310 must be authorized to an exclusive lock on the associated disc piece.Computing machine 310 comes from lock on these dish pieces of database lock manager 320 requests by sending a request on the network 314 externally.If the lock that database lock manager 320 can authorization requests, then database lock manager 320 is by externally authorizing lock to computing machine 310 transmissions one message on the network 314, and almost side by side send a message to storage subsystem 330, notice storage subsystem 330 can be expected from the I/O request of the dish piece of a visit of client computer acceptance particular range.Database lock manager 320 transmits this message by private network 322 to storage subsystem 330.Similar with the example of front, database lock manager 320 is examples of a request manager, and storage subsystem 330 has constituted a data object management device.
If the dish piece that storage subsystem 330 is determined to be authorized to lock is not in high-speed cache 332, storage subsystem 330 is initiated I/O operation to memory disc 334.Computing machine 310 is because of the lock mandate on the dish piece that has obtained to ask, so initiate an I/O operation to storage subsystem 330.When storage subsystem 330 receives the I/O request that computing machine 310 initiates by data network 316, may the look ahead dish piece of request and they are stored in the high-speed cache 332 of storage subsystem.The high-speed cache even the dish piece of request is not also all packed into, storage subsystem had been initiated the physics I/O operation from memory disc 334 before the request of receiving computing machine 310.Therefore, provide the stand-by period of request dish piece less than " prompting " stand-by period when looking ahead that does not have according to the database lock manager from high-speed cache 332.
In the realization of describing in conjunction with Fig. 6 in another example of computer environment of the present invention, a concentrated storing metadata controller 434 co-exists in a storage subsystem 420.In this environment, one or more computing machines are connected to data storage subsystem by a data network.As an example, as shown in Figure 6, a computing machine 410 is by data network 412 and storage subsystem 420 swap datas.Storage subsystem 420 comprises a server 430 that is connected to high-speed cache 322 and memory disc 424.Server 430 comprises logical partition 431 and 432.
In this example, the function of metadata controller 434 and storage subsystem controller 433 is carried out by the software on the logical partition that operates in server 430 (LPAR) 432 and 431 respectively.The virtual input/output bus 436 of use between metadata controller LPAR 432 and storage subsystem controller LPAR 431 is sent to storage subsystem controller 433 with high speed and low stand-by period from metadata controller 434 about " prompting " to the following I/O request of storage subsystem 420 of expection.Look ahead the dish piece to the advantage of storage subsystem high-speed cache by being improved communicating by letter of use high speed low latency between metadata controller and the storage subsystem controller.In this example, metadata controller 434 is respectively the example of request manager and data object management device with storage subsystem controller 433.
The present invention can be contained in a kind of product with computer usable medium for example (for example one or more computer program).This medium has for example computer-readable program code devices or logic (for example instruction, code, order etc.) therein, provides and promotes ability of the present invention.This product can be used as the part of system for computer or sells separately.
In addition, can provide at least one machine-readable program storage device, it has embodied the executable instruction repertorie of at least one machine and has realized ability of the present invention.
Process flow diagram described herein is an example.Under the situation that does not break away from spirit of the present invention, figure described herein or step (or operation) can have many mutation.For example, can carry out each step, perhaps increase, delete or revise some steps by different orders.All these mutation all are considered as a part of the present invention.
Although portray and described preferred embodiment here in detail, to being familiar with the people of correlation technique, can make various modifications, increase, replacement or the like in the case of without departing from the spirit of the present invention obviously, thereby these all are regarded as belonging to as in the defined scope of the invention in claims.
Claims (20)
1. the method for a management request in communication environment, this method comprises:
Receive a request relevant with metadata by a manager, this metadata is corresponding to separating the data of preserving with this metadata; And
Notify another manager one request expection, that this another manager will receive by this manager, so that this another manager is prepared for this expection request.
2. the method for claim 1 comprises further by this another manager and preparing for this expection request that this is prepared in response to described notice.
3. method as claimed in claim 2, wherein said preparation comprises the content of the high-speed cache in the management data storage subsystem.
4. method as claimed in claim 2, wherein said preparation comprise the visit to these data of leading subscriber or client computer.
5. method as claimed in claim 2 further comprises:
By the almost while of this manager, send replying of a response described request to communication unit in described notice; And
Receive this expection request by described another manager, wherein said preparation begins before this reception of being undertaken by described another manager.
6. method as claimed in claim 3, wherein said management to content comprises from the one or more storage mediums of the data storage subsystem one or more data blocks of looking ahead, thereby those data block store are in high-speed cache, and those data blocks comprise these data of at least a portion.
7. method as claimed in claim 3, wherein said management to content comprises the storage unit that discharges high-speed cache, so that storage unit can be used for storing other data, those cell stores comprise the data block of these data of at least a portion.
8. request management system that is used for communication environment, this system comprises:
Be used for being received by a manager device of a request relevant with metadata, this metadata is corresponding to separating the data of preserving with this metadata; And
Be used for notifying another manager one request expection, that this another manager will receive, so that the device that this another manager is prepared for this expection request by this manager.
9. system as claimed in claim 8 comprises further being used for the device of being prepared for this expection request by this another manager that this device that is used to prepare is in response to the described device that is used to notify.
10. system as claimed in claim 9, the wherein said device that is used to prepare comprises the device of the content that is used for management data storage subsystem high speed buffer memory.
11. system as claimed in claim 9, the wherein said device that is used to prepare comprises and is used for leading subscriber or the client computer device to the visit of these data.
12. system as claimed in claim 9 further comprises:
Be used for sending the device of replying of a response described request to communication unit by the almost while of this manager in the expection request of notifying described another manager to receive; And
Be used for being received by described another manager the device of this expection request, the wherein said device that is used to prepare began to prepare for this expection request before the described device that is used to receive receives this expection request.
13. system as claimed in claim 10, the wherein said device that is used for organize content comprises and being used for from the look ahead device of one or more data blocks of the one or more storage mediums of data storage subsystem, thereby described data block store is in high-speed cache, and described data block comprises these data of at least a portion.
14. system as claimed in claim 10, the wherein said device that is used for organize content comprises and is used to discharge the storage unit of high-speed cache so that storage unit can be used for storing the device of other data that described cell stores comprises the data block of these data of at least a portion.
15. at least a machine-readable program storage device, its embody at least one can carry out by machine, with carry out a kind of in communication environment the instruction repertorie of the method for management request, this method comprises:
Receive the request relevant with metadata by a manager, this metadata is corresponding to separating the data of preserving with this metadata; And
Notify another manager one request expection, that this another manager will receive by this manager, so that this another manager is prepared for this expection request.
Prepare for the request of this expection 16. at least a program storage device as claimed in claim 15, wherein said method further comprise by this another manager, this is prepared in response to described notice.
17. at least a program storage device as claimed in claim 16, wherein said preparation comprise the content of management data storage subsystem high speed buffer memory.
18. at least a program storage device as claimed in claim 16, wherein said preparation comprise the visit to these data of leading subscriber or client computer.
19. at least a program storage device as claimed in claim 16, wherein said method further comprises:
By described manager with described notice almost simultaneously, send replying of a response described request to communication unit; And
Receive this expection request by described another manager, wherein said preparation begins before this reception of being undertaken by described another manager.
20. at least a program storage device as claimed in claim 17, wherein said management to content comprises from the look ahead device of one or more data blocks of the one or more storage mediums of this data storage subsystem, thereby described data block store is in this high-speed cache, and described data block comprises these data of at least a portion.
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2004
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2007
- 2007-09-12 US US11/854,002 patent/US7818309B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102446212A (en) * | 2010-09-30 | 2012-05-09 | 国际商业机器公司 | System and method for creating a single library image from multiple independent tape libraries |
| US8767334B2 (en) | 2010-09-30 | 2014-07-01 | International Business Machines Corporation | System, method, and computer program product for creating a single library image from multiple independent tape libraries |
| CN102446212B (en) * | 2010-09-30 | 2015-02-25 | 国际商业机器公司 | System and method for creating a single library image from multiple independent tape libraries |
| US9013822B2 (en) | 2010-09-30 | 2015-04-21 | International Business Machines Corporation | Creating a single library image from multiple independent tape libraries |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1292352C (en) | 2006-12-27 |
| US20050149562A1 (en) | 2005-07-07 |
| US7818309B2 (en) | 2010-10-19 |
| US20070299809A1 (en) | 2007-12-27 |
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